Question about Ryobi 30 Cubic Centimeter Curved Shaft Gas Trimmer

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Have a Ryobi 990r. I need to know how to set fuel mixture screws.Has 3. Thanks, Jim

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Posted on Jan 02, 2017

boscia
  • 163 Answers

SOURCE: on backpac blower 25.4cc fuel mixture ratio

40:1

Posted on Dec 02, 2008

SOURCE: The fuel line leaks coming out of the plastic fuel

There is a little white ring that goes over the line and into the opening on the tank. This is what seals the line so the gas won't leak out. They are about $1.00 at any small engine service shop.

Posted on May 15, 2009

  • 1 Answer

SOURCE: i have a ryobi weedeater model 764r. how do i

I replaced the gas line hose and the spark plug on a 2075r ryobi proffesional weed eater. Now it will not start. Thank you

Posted on Jun 27, 2009

  • 34 Answers

SOURCE: I NEED TO FIND OUT THE FUEL MIXTURE FOR MY RYOBI

32:1

Posted on Jul 19, 2009

  • 148 Answers

SOURCE: Is the fuel mix on a ryobi gas trimmer 50-1 or 32-1 ?

My Ryobi 720r is 32-1 but just to be sure go to www.managemyhome.com and download your owners manual to be sure.

Posted on Aug 17, 2009

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1 Answer

What to set the carb jet screws at.


Hi, Jim it should be noted that the "AIR FUEL" mixture screw adjustment "ONLY" manages your idle and has no effect on any other circuit also any intake leaks must be repaired before the A/F adjustment procedure can be performed otherwise you will never obtain a proper idle and you will waste a lot of time chasing the impossible. The A/F mixture screw's purpose is to fine tune the fuel charge entering the combustion chamber. The following applies to both 2 and 4 stroke engines:
1. The mixture screw may be sealed at the factory with a Welch Plug please review the following video for removal.
https://www.youtube.com/watch?v=wAXcksgvDkM
2. The mixture screw manages a range of 3 complete 360-degree counterclockwise turns from the bottom/closed position.
3. The mixture screw should have a spring and o-ring for tension and sealing integrity.
4. Turn the mixture screw clockwise until it gently bottoms out, this makes the fuel charge very lean and the engine should not idle if it does then the pilot/idle jet is too big and needs to be replaced with the next size smaller.
5. Turn the mixture screw 1 and 1/2 turns counterclockwise to establish a baseline for starting the engine.
6. To fine-tune the idle circuit, adjust the mixture screw 1/4 turn in or out to achieve maximum idle RPM, wait 15 seconds between each adjustment for the idle to settle.
7. Never go past 3 full turns out this will make the fuel charge rich, foul plugs, and produce black smoke out of the exhaust, if the engine RPM keeps increasing past 3 turns the pilot/idle jet is too small and needs to be replaced with the next size larger.
7. After achieving maximum idle back out the mixture screw another 1/8 of a turn then adjust the throttle cable idle stop screw to 950-1050 RPM.
8. This procedure works great on 99% of all engines, for the 1% that demand a more robust throttle response on aftermarket monster fuel delivery systems additional tweaking outside the box may be necessary.
For more information about your issue and valuable "FREE" downloads that you will need please click on the blue links below. Good luck and have a wonderful day.

Jun 02, 2017 | Motorcycles

1 Answer

Ryobi s430 will idle but will stall out when throttle opens. This carburetor has one idle adjustment screw and one fuel mixture screw.


Those carbs are a pain. Try arousing the idle screw, turun it to the right, then try to see if it will idle. You will have to tinker with the adjustment screw and the idle screw. Eventually you're gonna need a new carburetor. You can rebuild it, BUT , chances are those cheap carburetors never are the same.

Sep 13, 2015 | Ryobi Garden

1 Answer

How do you adjust the high speed mixture screw? I have a Ryobi RLH1100a MK III 31cc line trimmer, and after changing the fuel lines, it will start but not idle more than about 3 - 5 seconds before it...


Hi montex124, I will try to help. In the past few years carb makers have been making changes. Some carbs have no adjustment at all, the ports are all fixed inside the carb. Other carbs have only the idle speed mixture screw that can be adjusted, like yours seems to have. Is this screw you mention at the top and completely outside of the carb to adjust the throttle? If it is it's probably the idle speed screw which can be adjusted to any idle speed you want and has nothing to do with the air fuel mixture but If it is right next to the idle mixture screw, it might be the high speed mixture screw but is capped so it can't be adjusted. The low and high speed mixture screws should be marked next to each screw H and L.
The 1 1/2 turns suggested is sometimes just right but other times has to be adjusted, so you can try adjusting it to get your idle but maybe adjust the idle speed screw first to get a higher RPM so it doesn't stall on you. Like I said earlier it just adjusts the throttle, and is like when you are using it, and giving it gas as they say. I hope this helps just a bit. Regards and good luck. Get back to me if you need more help or just let me know how you did. Denis.

Feb 28, 2011 | Ryobi Garden

1 Answer

I have no spark on my ryobi 990r. i have replaced sparkplug. i have checked and have plenty of fuel


make sure the gap on the plug isnot to wide other wise u will not get any spark or just a weak spark

May 11, 2010 | Ryobi 30 Cubic Centimeter Curved Shaft Gas...

1 Answer

Ryobi BC30 Weedeater - Cannot Start


Check the fuel lines for cracks/breaks. If they are o.k., then:

You will need to disassemble the carburetor and spray with carb.cleaner. Make sure the small screen is free of debris. (Should be able to see daylight through it.) Use a Den Tek Brush, (http://www.drugstore.com/products/prod.asp?pid=165357&catid=1152), to clean the small portals in carb. These portals can become blocked. Reassemble and start.

If you need further assistance, just let me know.

Jim

Jun 20, 2009 | Ryobi 30 Cubic Centimeter Curved Shaft Gas...

1 Answer

Roybi bc 30 trimmer carb problems


First, check fuel lines for cracks/breaks. Replace if they are bad.

Next, you will need to do a little bit more detail on the car.

Disassemble the carburetor and spray with carb.cleaner. Make sure the small screen in the carb. is free of debris. ( You should be able to see daylight through it.) IMPORTANT: Use a Den Tek Brush, (http://www.drugstore.com/products/prod.asp?pid=165357&catid=1152), to clean the small portals in carb. Reassemble and start.

(NOTE: If the cleaning doesn't work, then buy a carb. kit and replace all appropriate parts.)

If you need further assistance, just let me know.

Jim

Jun 14, 2009 | Ryobi Garden

1 Answer

The fuel line leaks coming out of the plastic fuel tank on my Ryobi Brush Trimmer (990R I think). I am replacing the old plastic fuel lines into the tank but noticed that they are a little loose too. Any...


There is a little white ring that goes over the line and into the opening on the tank. This is what seals the line so the gas won't leak out. They are about $1.00 at any small engine service shop.

May 15, 2009 | Ryobi 30 Cubic Centimeter Gas Brush Cutter

4 Answers

Carb adjustment


Hello:

>>The Following is the Instruction File for Setting the Air Mixture Screws. Any Input is Appreciated. The Procedure is the Same for 1 or 2 Mixture Screws, Just Use the Instruction File and Skip Over the Section with the Missing Mixture Screw ( Usually the H Mixture Screw).
>>Now Setting the Air Mixture Screws:
>>****Turn the Idle Air (L) and Main Air (H) Mixture Screws In Until SNUG **Do Not Jam** Then Reverse Both Screws 1 1/2 Turns. Set the Throttle Full Open, Start the Engine.
>>Turn the Main Air (H) Mixture Screw Clockwise Until Proper Revs are Obtained. **Carefully Use your Finger and Move the Governor Arm to Rev the Engine (on Chainsaws and Trimmers Use the Trigger to Rev the Engine) Until you Reach Max RPMs (on Chainsaws and Trimmers, the RPMs are Not Set to MAX. Set to Max and then Reverse the Setting Screw 1/4 or 1/2 Turn. If the H Mixture Screw is Set too High; the Engine will be Starved for the Oil in the Gas and Damage the Piston and Jug/Cylinder) and the Engine is Running Proper at Full Throttle Up a Grade. Occasionally you May have to Turn this Counter Clockwise to Achieve the Proper Revs.**
>>Now Allow the Engine to Idle. Set the Engine Idle Screw (Not Idle Air) so the Engine will Stay Running if Required.
>>Now Set the Idle Air (L) Mixture Screw so there is No Hesitation when Rapidly Throttling from Idle to Full Throttle. Reset the Engine Idle if Required.****
>>If you Hit a Snag or this Does Not Correct the Problem, I am Here if You Require More Assistance. Hope this Helps. Let me Know What Happens, Please. May the All Mighty Bless You and Yours. Be Safe and Happy.
>>Thanks.

Respectfully

John

Apr 21, 2009 | Ryobi 30 Cubic Centimeter Curved Shaft Gas...

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